You are asking too much of people to expect your average DF runner to do Hashmal well. I have to listen how someone in O4N was running to fight on the side with the tank, this is done in lv 50 trials, ramuh hard. It is the same reason people find it hard to push fire II quickly, tossing out thunders, having job quests cleared to 70 before entering expert. RDM that know how to use melee combos. Any dps that does not use all their tools on trash and keeps saving for boss and wonders why someone tells them 25 min runs are slow, tanks that never uses an OGCD, healers that never use a DPS ability, even refusing to assize once a whole run, list goes on of people lacking common sense.

In the end of the day people fail there because the game is too easy, too easy to carry them. If this was not the case, you wouldn't see people undergeared for DFs or trying to cheese the ilevel requirement.